HP SunSoft Pascal 4.0 Manual do Utilizador descarregar pdf (Página 162)

138 Pascal 4.0 User’s Guide

Compatibility of Types for C++ and Pascal

Table 6-1 and Table 6-2 on page 90 list the default sizes and alignments of

compatible types for C and Pascal. They apply to C++ as well.

C++ Name Encoding

To implement function overloading and type-safe linkage, the C++ compiler

normally appends type information to the function names. To prevent the C++

compiler from doing so, and to allow Pascal to call a C++ function, declare the

C++ function with the extern "C" language construct. One common way to

do this is in the declaration of a function, like this:

For brevity, you can also combine extern "C" with the deﬁnition of the

function, as in:

Procedure Calls: C++–Pascal

Following are examples that illustrate how a C++ main program calls a Pascal

procedure. Included in each example are the Pascal procedure, the C++ main

program, and the commands to compile and execute the ﬁnal program.

extern "C" void f (int);

...

void f (int) { /* ...body of f... */ }

extern "C" void f (int)

{ /* ...body of f... */ }

The Pascal procedure, Samp,

in the ﬁle, Samp.p

procedure Samp (var i: integer; var r: real);

begin

i := 7;

r := 3.14;

end

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HP SunSoft Pascal 4.0 Manual do Utilizador Página 162